Bash Alias
An alias is a short name for a longer command, like alias ll='ls -la'.
Aliases you type at the prompt last until you close the terminal. Put them in ~/.bashrc to keep them.
Create, use and remove an alias
alias hello='echo "Hello, World!"'
hello
Hello, World!
alias hello
alias hello='echo "Hello, World!"'
unalias hello
hello
bash: hello: command not found
